Amphiura multispina (Ophiuroidea, Amphiuridae) from the Upper Pleistocene Kioroshi Formation in a Drill Core at Nagareyama, Chiba, Central Japan

Over 100 well-preserved dissociated ophiuroid arm ossicles, i.e., lateral arm plates, dorsal arm plates, ventral arm plates, vertebrae and arm spines, were recovered from the upper Pleistocene Kioroshi Formation in the core of borehole GS-NY-1 at Nagareyama, Chiba Prefecture, central Japan. Followin...

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Published inPaleontological Research Vol. 27; no. 3; pp. 310 - 323
Main Authors Ishida, Yoshiaki, Kaneko, Minoru, Yokobori, Asaka, Mita, Rin, Ishikawa, Hiroyuki, Thuy, Ben, Numberger-Thuy, Lea D., Fujita, Toshihiko
Format Journal Article
LanguageEnglish
Published Tokyo UniBio Press 04.01.2023
The Paleontological Society of Japan
BioOne
Subjects
Amphiura
Amphiuridae
Boreholes
extant species
Fossil fuels
Fossils
lateral arm plate
ophiuroid
ossicle
paleoenvironment
Paleontology
Pleistocene
Spines
Taphonomy
Vertebrae
Chiba Japan
Japan
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Summary:Over 100 well-preserved dissociated ophiuroid arm ossicles, i.e., lateral arm plates, dorsal arm plates, ventral arm plates, vertebrae and arm spines, were recovered from the upper Pleistocene Kioroshi Formation in the core of borehole GS-NY-1 at Nagareyama, Chiba Prefecture, central Japan. Following comparison with the lateral arm plates of ten extant amphiurid species occurring in the seas around Japan and with previously published fossil taxa in this family, the ossicles from Nagareyama were identified as belonging to the extant species, Amphiura multispina. This is the first fossil record of this form and the stratigraphically youngest of the Amphiuridae. The taphonomy and paleoenvironment of the brittle star fossils described are also discussed.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 14
ISSN:1342-8144
1880-0068
DOI:10.2517/PR220001